Hydrothermal Anhydrite in veins is usually hydrated to gypsum by groundwater in close to-floor exposures. It is often connected with the minerals halite and sulfur. Gypsum is the most typical sulfate mineral.[17] Pure gypsum is white, but other substances uncovered as impurities might give a variety of shades to area https://www.propanraya.com/id/produk/eco-gypsum-ee-4050